Answer: modulus elasticity = 4.9 * 10^6 N/in²
Explanation: modulus elasticity = tensile stress / tensile strain.
Tensile stress = force / area.
Force = 10kip = 4.44 * 10^4N ( note that 1kip = 4448.22N), area = 12 in²
Tensile stress = 4.44 * 10^4/ 12 = 3.7 * 10³ N/in²
Tensile strain = extension/ length
extension= 0.006in length = 8 in
Tensile strain = 0.006/ 8 = 7.5 * 10^-4.
Modulus = stress/ strain = 3.7 * 10³/ 7.5 * 10^-4
Modulus = 0.49 * 10^7
modulus = 4.9 * 10^6 N/in²
